U.S. stocks opened slightly lower Wednesday as investors remained cautious as they waited for more economic data to gauge the Federal Reserve's next policy move. The S&P 500 index opened 3 points, or 0.1%, lower at 2,183. The Dow Jones Industrial Average slipped 25 points, or 0.1%, to 18,511. Meanwhile the Nasdaq Composite Index began the session off 2 point at 5,274.
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